Finding the Fourth Proportional to 42,884.82, 64,349.16 and 20,420.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,884.82 : 64,349.16 = 20,420.88 : x
2. Step 2: Convert to fraction form
   42,884.82/64,349.16 = 20,420.88/x
3. Step 3: Cross multiply
   42,884.82x = 64,349.16 × 20,420.88
4. Step 4: Simplify right side
   42,884.82x = 1,314,066,474.46
5. Step 5: Solve for x
   x = 1,314,066,474.46/42,884.82
6. Step 6: Final answer
   x = 30,641.76